Vortec VCM & EVAP

[Gonyou, Jeremy (.)]

I have a guess...

Some manuafactuars are going to a single-rail as an emissions device.
Cycling fuel through the return line heats it up and causes more evaporative
emissions...hence the single rail.  

My guess is that the 96+ Vortechs use a single rail and a fuel pressure
sensor to better estimate what the injectors are actually spraying out - as
a single rail can't use the traditional fuel pressure regulator.

Jeremy  


>I'm wondering if someone can clue me in on some of the functions of the
fuel
>pressure sensor in the new (96 and up) Vortec trucks? ...

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